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Updated code that fixes broken DNS on IPv6 networks

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This commit is contained in:
Gunnar Skjold 2023-05-21 13:50:05 +02:00
parent 104617afd2
commit 9f7e174c7b
1 changed files with 14 additions and 13 deletions
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27
src/AmsToMqttBridge.cpp
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@ -160,12 +160,23 @@ void debugPrint(byte *buffer, int start, int length);
#if defined(ESP32)
uint8_t dnsState = 0;
ip_addr_t dns0;
void WiFiEvent(WiFiEvent_t event) {
switch(event) {
case ARDUINO_EVENT_WIFI_STA_GOT_IP:
const ip_addr_t* dns = dns_getserver(0);
memcpy(&dns0, dns, sizeof(dns0));
IPAddress res;
int ret = WiFi.hostByName("hub.amsleser.no", res);
if(ret == 0) {
dnsState = 2;
debugI_P(PSTR("No DNS, probably a closed network"));
} else {
debugI_P(PSTR("DNS is present and working, monitoring"));
dnsState = 1;
}
break;
}
}
@ -634,7 +645,6 @@ void handleNtpChange() {
config.ackNtpChange();
}
uint8_t dnsState = 0;
void handleSystem(unsigned long now) {
unsigned long start, end;
if(now - lastSysupdate > 60000) {
@ -649,20 +659,11 @@ void handleSystem(unsigned long now) {
}
#if defined(ESP32)
if(dnsState != 2) {
IPAddress res;
int ret = WiFi.hostByName("hub.amsleser.no", res);
if(ret == 0) {
if(dnsState == 0) {
dnsState = 2;
} else {
if(dnsState == 1) {
const ip_addr_t* dns = dns_getserver(0);
if(memcmp(&dns0, dns, sizeof(dns0)) != 0) {
dns_setserver(0, &dns0);
debugI_P(PSTR("Had to reset DNS server"));
}
} else if(ret == 1) {
if(dnsState == 0) {
dnsState = 1;
}
}
}
#endif